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9#include <linux/interrupt.h>
10#include <linux/irq.h>
11#include <linux/kernel.h>
12#include <linux/kexec.h>
13#include <linux/page-flags.h>
14#include <linux/set_memory.h>
15#include <linux/smp.h>
16
17#include <asm/cacheflush.h>
18#include <asm/cpu_ops.h>
19#include <asm/daifflags.h>
20#include <asm/memory.h>
21#include <asm/mmu.h>
22#include <asm/mmu_context.h>
23#include <asm/page.h>
24
25#include "cpu-reset.h"
26
27
28extern const unsigned char arm64_relocate_new_kernel[];
29extern const unsigned long arm64_relocate_new_kernel_size;
30
31
32
33
34#define kexec_image_info(_i) _kexec_image_info(__func__, __LINE__, _i)
35static void _kexec_image_info(const char *func, int line,
36 const struct kimage *kimage)
37{
38 unsigned long i;
39
40 pr_debug("%s:%d:\n", func, line);
41 pr_debug(" kexec kimage info:\n");
42 pr_debug(" type: %d\n", kimage->type);
43 pr_debug(" start: %lx\n", kimage->start);
44 pr_debug(" head: %lx\n", kimage->head);
45 pr_debug(" nr_segments: %lu\n", kimage->nr_segments);
46 pr_debug(" kern_reloc: %pa\n", &kimage->arch.kern_reloc);
47
48 for (i = 0; i < kimage->nr_segments; i++) {
49 pr_debug(" segment[%lu]: %016lx - %016lx, 0x%lx bytes, %lu pages\n",
50 i,
51 kimage->segment[i].mem,
52 kimage->segment[i].mem + kimage->segment[i].memsz,
53 kimage->segment[i].memsz,
54 kimage->segment[i].memsz / PAGE_SIZE);
55 }
56}
57
58void machine_kexec_cleanup(struct kimage *kimage)
59{
60
61}
62
63int machine_kexec_post_load(struct kimage *kimage)
64{
65 void *reloc_code = page_to_virt(kimage->control_code_page);
66
67 memcpy(reloc_code, arm64_relocate_new_kernel,
68 arm64_relocate_new_kernel_size);
69 kimage->arch.kern_reloc = __pa(reloc_code);
70 kexec_image_info(kimage);
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75
76 dcache_clean_inval_poc((unsigned long)reloc_code,
77 (unsigned long)reloc_code +
78 arm64_relocate_new_kernel_size);
79 icache_inval_pou((uintptr_t)reloc_code,
80 (uintptr_t)reloc_code +
81 arm64_relocate_new_kernel_size);
82
83 return 0;
84}
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92
93int machine_kexec_prepare(struct kimage *kimage)
94{
95 if (kimage->type != KEXEC_TYPE_CRASH && cpus_are_stuck_in_kernel()) {
96 pr_err("Can't kexec: CPUs are stuck in the kernel.\n");
97 return -EBUSY;
98 }
99
100 return 0;
101}
102
103
104
105
106static void kexec_list_flush(struct kimage *kimage)
107{
108 kimage_entry_t *entry;
109
110 for (entry = &kimage->head; ; entry++) {
111 unsigned int flag;
112 unsigned long addr;
113
114
115 dcache_clean_inval_poc((unsigned long)entry,
116 (unsigned long)entry +
117 sizeof(kimage_entry_t));
118
119 flag = *entry & IND_FLAGS;
120 if (flag == IND_DONE)
121 break;
122
123 addr = (unsigned long)phys_to_virt(*entry & PAGE_MASK);
124
125 switch (flag) {
126 case IND_INDIRECTION:
127
128 entry = (kimage_entry_t *)addr - 1;
129 break;
130 case IND_SOURCE:
131
132 dcache_clean_inval_poc(addr, addr + PAGE_SIZE);
133 break;
134 case IND_DESTINATION:
135 break;
136 default:
137 BUG();
138 }
139 }
140}
141
142
143
144
145static void kexec_segment_flush(const struct kimage *kimage)
146{
147 unsigned long i;
148
149 pr_debug("%s:\n", __func__);
150
151 for (i = 0; i < kimage->nr_segments; i++) {
152 pr_debug(" segment[%lu]: %016lx - %016lx, 0x%lx bytes, %lu pages\n",
153 i,
154 kimage->segment[i].mem,
155 kimage->segment[i].mem + kimage->segment[i].memsz,
156 kimage->segment[i].memsz,
157 kimage->segment[i].memsz / PAGE_SIZE);
158
159 dcache_clean_inval_poc(
160 (unsigned long)phys_to_virt(kimage->segment[i].mem),
161 (unsigned long)phys_to_virt(kimage->segment[i].mem) +
162 kimage->segment[i].memsz);
163 }
164}
165
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170
171void machine_kexec(struct kimage *kimage)
172{
173 bool in_kexec_crash = (kimage == kexec_crash_image);
174 bool stuck_cpus = cpus_are_stuck_in_kernel();
175
176
177
178
179 BUG_ON(!in_kexec_crash && (stuck_cpus || (num_online_cpus() > 1)));
180 WARN(in_kexec_crash && (stuck_cpus || smp_crash_stop_failed()),
181 "Some CPUs may be stale, kdump will be unreliable.\n");
182
183
184 kexec_list_flush(kimage);
185
186
187 if ((kimage != kexec_crash_image) && (kimage->head & IND_DONE))
188 kexec_segment_flush(kimage);
189
190 pr_info("Bye!\n");
191
192 local_daif_mask();
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206 cpu_soft_restart(kimage->arch.kern_reloc, kimage->head, kimage->start,
207 kimage->arch.dtb_mem);
208
209 BUG();
210}
211
212static void machine_kexec_mask_interrupts(void)
213{
214 unsigned int i;
215 struct irq_desc *desc;
216
217 for_each_irq_desc(i, desc) {
218 struct irq_chip *chip;
219 int ret;
220
221 chip = irq_desc_get_chip(desc);
222 if (!chip)
223 continue;
224
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227
228
229 ret = irq_set_irqchip_state(i, IRQCHIP_STATE_ACTIVE, false);
230
231 if (ret && irqd_irq_inprogress(&desc->irq_data) &&
232 chip->irq_eoi)
233 chip->irq_eoi(&desc->irq_data);
234
235 if (chip->irq_mask)
236 chip->irq_mask(&desc->irq_data);
237
238 if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
239 chip->irq_disable(&desc->irq_data);
240 }
241}
242
243
244
245
246void machine_crash_shutdown(struct pt_regs *regs)
247{
248 local_irq_disable();
249
250
251 crash_smp_send_stop();
252
253
254 crash_save_cpu(regs, smp_processor_id());
255 machine_kexec_mask_interrupts();
256
257 pr_info("Starting crashdump kernel...\n");
258}
259
260void arch_kexec_protect_crashkres(void)
261{
262 int i;
263
264 kexec_segment_flush(kexec_crash_image);
265
266 for (i = 0; i < kexec_crash_image->nr_segments; i++)
267 set_memory_valid(
268 __phys_to_virt(kexec_crash_image->segment[i].mem),
269 kexec_crash_image->segment[i].memsz >> PAGE_SHIFT, 0);
270}
271
272void arch_kexec_unprotect_crashkres(void)
273{
274 int i;
275
276 for (i = 0; i < kexec_crash_image->nr_segments; i++)
277 set_memory_valid(
278 __phys_to_virt(kexec_crash_image->segment[i].mem),
279 kexec_crash_image->segment[i].memsz >> PAGE_SHIFT, 1);
280}
281
282#ifdef CONFIG_HIBERNATION
283
284
285
286
287void crash_prepare_suspend(void)
288{
289 if (kexec_crash_image)
290 arch_kexec_unprotect_crashkres();
291}
292
293void crash_post_resume(void)
294{
295 if (kexec_crash_image)
296 arch_kexec_protect_crashkres();
297}
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313bool crash_is_nosave(unsigned long pfn)
314{
315 int i;
316 phys_addr_t addr;
317
318 if (!crashk_res.end)
319 return false;
320
321
322 addr = __pfn_to_phys(pfn);
323 if ((addr < crashk_res.start) || (crashk_res.end < addr))
324 return false;
325
326 if (!kexec_crash_image)
327 return true;
328
329
330 for (i = 0; i < kexec_crash_image->nr_segments; i++)
331 if (addr >= kexec_crash_image->segment[i].mem &&
332 addr < (kexec_crash_image->segment[i].mem +
333 kexec_crash_image->segment[i].memsz))
334 return false;
335
336 return true;
337}
338
339void crash_free_reserved_phys_range(unsigned long begin, unsigned long end)
340{
341 unsigned long addr;
342 struct page *page;
343
344 for (addr = begin; addr < end; addr += PAGE_SIZE) {
345 page = phys_to_page(addr);
346 free_reserved_page(page);
347 }
348}
349#endif
350